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»VCH  OF  THE 
UNIVERSITY    OF    CALIFORNIA  agricultural  Experiment  Station 

College  of  agriculture  e-  j-  wickson,  director        wL  i*^ Y"   lO 

BERKELEY,    CALIFORNIA 


CIRCULAR  No.  49 

(February,  1910) 


INSECTICIDES 

By  H.  J.  QUAYLE. 


1.  Lime  Sulphur: 

Quicklime,  33  pounds;       Sulphur,  66  pounds;       Water,  200  gallons. 

Sift  sulphur  through  box  with  screen  bottom  into  boiling  tank  with  50 
gallons  of  water.  Add  the  lime  and  boil  45  minutes  to  one  hour.  Stir  fre- 
quently. Strain  through  cheese  cloth  or  burlap  and  dilute  to  make  200  gallons. 
If  extra  lime  is  desired  strain  in  milk  of  lime  when  spray  is  ready  for  use. 

2.  Commercial  Lime  Sulphur: 

The  standard  strength  corresponding  to  the  above  formula  is  obtained 
when  commercial  solution  is  diluted  1  to  9. 

Either  of  the  above  for  San  Jose  and  other  armored  scales  to  be  applied 
during  dormant  season,  preferably  in  early  winter  or  early  spring.  For 
Peach  Moth  as  the  buds  are  expanding  in  the  spring. 

3.  Distillate: 

A   28°  gravity  oil  refined  for  tree  use. 

Distillate,  12  gallons;     Water,  200  gallons. 

For  use  only  with  power  sprayer  with  good  agitator,  which  is  necessary 
to  make  a  mechanical  mixture  of  the  oil  and  water. 

For  the  Brown  Apricot,  Black,  and  other  unarmored  scales,  and  for  Woolly 
Aphis,  to  be  applied  during  dormant  season,  preferably  in  early  winter. 

4.  Distillate  Potash: 

Distillate,  10  gallons;     Lye  or  Caustic  Soda,  5  pounds;     Water,  200  gallons. 

Preparation  and  uses  same  as  under  3.  Has  the  advantage  of  freeing 
tree  from  moss. 

5.  Distillate  Tobacco: 

Distillate,  4  gallons ;    Black  leaf  tobacco  extract,  3  gallons ;    Water,  200  gallons. 
For  thrips  and  plant  lice,  to  be  applied  by  power  outfit  only. 

6.  Kerosene  Emulsion: 

Soap,  i/>   pound;     Kerosene,  1    gallon;      Water,    10  to  25  gallons. 

Dissolve  soap  in  1  gallon  hot  water.  Add  1  gallon  kerosene.  Mix 
thoroughly  with  spray  pump  by  turning  nozzle  back  into  mixture. 

For  plant  lice  and  other  sucking  insects  during  growing  season,  dilute 
with  20  to  25  gallons  of  water. 

For  Scale  insects,  Woolly  Aphis  and  other  sucking  insects  during 
dormant  season,  dilute  with  10  gallons  of  wrater. 

Kerosene  emulsion  can  be  used  on  small  scale  with  hand  sprayer. 

[over] 


7.  Miscible  Oils: 

.  Commercial  preparations  to  be  used  according  to  directions.     Uses  same 
as  3,  4,  5,  and  6.    Power  outfit  for  application  not  necessary. 

8.  Straight  Kerosene: 

Kerosene  or  Water  White  Oil,  20  gallons;     Water,  200  gallons. 
In  use  for  scale  insects  of  citrus  trees.     Application  by  power   outfit. 
Occasionally  also  2%  distillate  used  for  same  pests. 

9.  Soap  Solution: 

Soap,  1  pound;     Water,  6-12  gallons. 
For  plant  lice. 

10.  Tobacco: 

Tobacco  stems,  1  pound;     Water,  4  gallons. 
Steep  tobacco  in  1  gallon  hot  water.     Dilute  to  3  or  4  gallons.     Or, 

Black  leaf  extract,  1  gallon;     Water,  60-70  gallons. 
For  plant  lice,  thrips,  and  other  sucking  insects  during  growing  season. 

11.  Sulphur: 

Dry. — Thoroughly  dust  over  foliage  when  wet  with  dew.  Hydrated  lime 
sometimes  used  to  increase  adhesiveness. 

Spray. — Sulphur,  30  pounds;  Lime   (as  milk  of  lime),  15  pounds; 

Water,  200  gallons. 
For  red  spiders  and  for  silver  mite. 

12.  Lead  Arsenate: 

Lead  Arsenate,  6-10  pounds;     Water,  200  gallons. 
First  mix  arsenate  of  lead  with  two  or  three  gallons  of  water. 
For  Codling  Moth,  and  all  defoliating  insects. 

13.  Paris  Green: 

Lime,  5  pounds;     Paris  Green,  1%  pounds;     Water,  200  gallons. 
For  Codling  Moth,  and  all  defoliating  insects. 

14.  Hydrocyanic  Acid  Gas: 

Potassium  Cyanide,  1  part;     Sulphuric  Acid,  1  part;     Water,  3  parts. 

Place  water  and  acid  in  earthenware  vessel  and  add  cyanide.  To  be 
used  under  tents  or  in  tight  rooms  or  boxes. 

For  fumigating  buildings  and  the  like,  1  ounce  of  cyanide  to  each  100 
cu.  ft.  of  space  for  one  hour  or  more. 

For  use  against  scales  on  citrus  trees.  Ordinary  dosage  in  ounces  found 
by  multiplying  distance  around  by  distance  over  top  of  tented  tree  and 
pointing  off  two  places.     Example: 

Distance  around  bottom  Distance  over  top 

40  ft.  X  20  ft.  =  8.0  oz.  cyanide. 

15.  Carbon  Bisulphide: 

For  the  fumigation  of  stored  products  and  underground  insects,  and  for 
squirrels. 

Usual  dosage,  1  pint  to  1,000  cu.  ft.  of  space. 

Place  liquid  in  saucers  or  shallow  vessels  near  top  of  room  if  convenient. 
Inflammable:  avoid  lights. 

For  underground  insects,  a  tablespoonful  placed  in  holes  a  few  feet  apart. 

For  squirrels,  an  ounce  on  piec^  of  cotton,  size  of  walnut,  placed  in  hole 
and  tamped  in. 


